There is now a consensus that time and speed are linked. But how exactly should the change in time be defined?

From a philosophical point of view, there is one of the easiest ways to understand it.

In general, in the field of philosophy, time is defined as "the change of being". This was eventually proven to be true by the second law of thermodynamics. So, at what "speed" does existence change?

This answer is actually not complicated, because the speed of change in the existence of any object is the speed of the limit, that is, the speed of light.

Then when you are moving fast enough, since the speed of light, which is the limit, cannot be superimposed, eventually you will catch up with the speed of the change that exists. As a result, the change of existence is static relative to you. Then, time stops.

Of course, this is the simplest philosophical understanding. However, an important message is revealed here, that is, light is the most important yardstick of time and space. This phenomenon was discovered because of the irreconcilable problems that arise in the study of optical path differences.

Because no matter how the direction of motion is changed, the speed of light does not change in any inertial frame.

It's pretty incredible. Anyone can imagine that if you were sitting in a car and measuring the speed of another car, you would be different in the same direction or in the opposite direction. But the truth is, in fact, the results are the same.

So, how to understand this phenomenon?

It can be assumed that the length has contracted in the direction of motion, and this contraction cancels out the difference in the different directions of light. This leads to the first clue that motion can change length, but no force can unreasonably shrink the length of an object in the direction of motion. So, how exactly does this shrinkage length do it?

The answer is already on the horizon, but it's not enough.

After that, another phenomenon was discovered. That is, it is not enough to make up the difference just by considering the change in length. However, there is no more means to make up for it. But the final answer is actually very simple.

As long as the one that moves faster moves a little slower, the passage of time is a little slower.

Since the speed of light is constant, the motion must change both time and space in order to conform to the measured results. Therefore, time and space are not absolute.

Time and space, which were originally independent of each other, have reached a similar conclusion at this moment, thus moving towards unity—from relative time and relative space, absolute time and space have been obtained. (Note: In Minkowski space-time, the space-time interval between two events is absolute.) It does not change because time and space are relative. ）

So, what's out of the ordinary?

First of all, let's be sure that there are no absolute coordinates, so the scale of time dilation is actually acceleration and deceleration. However, it is important to note that if acceleration and deceleration are not involved, both frames of reference are actually slower in time for each other. It is only when one of the parties changes the speed to make itself the same as the other that it becomes the one of the time dilated.

That is, two sides with different speeds do not have the same timeline. Then in turn, time stop can be understood as having a different speed.

The cessation of time is actually true for both parties. It's not just that time stops when you look at it outside in the area where time stopped, it's exactly the same way around. (Note: For example, the dome has stopped the time around, and Mitsuki Umihara is outside.) Then, not only does the time for the dome to look at the sea hara light is stopped, but the time for the sea hara to look at the dome is actually stopped. Only when Qiongno returns to the timeline of Mitsuki Haihara can it be discovered that time has stopped on Qiongno's side. What if it's the other way around, and Mitsuki Umihara enters the timeline of the dome? Then the time stopped was Haihara Mitsugui. Therefore, the side that changes the velocity and is relatively stationary to another frame of reference is the side of time dilation. It is determined that the reason for the time dilation is that this side has changed the speed, and I don't know if you can understand it. ）

So, what does this area look like?

As I said before, time and space are unified and indivisible. So it's not just time that's changing. That is, looking in from the outside, the area where time has stopped is extremely distorted. And the reverse is exactly the same.

In reality, however, this distortion is not only relative, but does not even exist at all in the same frame of reference. (Note: Here I let the pesticide do the math, in simple terms, the area where the time stop is frozen in our opinion.) It seems that we can only see the moment when time stops, even if there has been a huge change inside. In other words, we should look a lot like a black hole in the past. Thanks to a process, we should be able to see the frequency of light drop rapidly. In reality, though, there are a number of issues that are overlooked here. For example, quality. ）

It's amazing, it's incredible, isn't it?

The Dome has completely distorted time and space to achieve such an astonishing effect.

The question is, what's the point? Fantasy monsters are also in the middle of it, in the same frame of reference as them, and will not be affected......

"No, no......"

If you think about it, you can see the key points.

The voice that had been echoing in Mai Trin's mind because of the electric induction was indeed no longer there at this time. Or rather, she couldn't hear it anymore.

What do you think this is?

Actually, it will be affected! Because time here also stops in relation to the outside frame of reference! In other words, whether it is a fantasy monster to a fantasy master, or a fantasy monster to a fantasy monster, their time relative to each other stops, and only the time of the dome is normal for the fantasy monster!

In other words, she uses the relativity of time to effectively sever the connection between the users of the fantasy Mitsute and the fantasy monsters!

Mai Trin didn't know what to say. As much as she wanted to find out why, it only made her more confused.

What is it to influence the transmission of information in a way that governs time? Even if it's always been a bit messy, she wouldn't dare to imagine such a thing.

As Dome said, she did what they needed to do with this attempt. It's just that this method is too unimaginable.

"Misaka-san...... Please ...... as soon as possible"

Before Mai Trin could recover from this shock, she heard the faint voice of the dome.

It's really very faint, so faint that Mikoto Misaka, who was right next to her, almost didn't hear it.

Although she has always been a quiet girl with a soft voice, it is the first time that Mai Trito has heard such a weak voice.

She turned her head to look at her in confusion, but what she saw surprised her.

The girl in front of her seemed to have lost her strength, and even her legs could not support the weight of her body. She fell limply to the ground in a lying position, her only barely supported upper body shaking, as if she was going to fall down at any moment. The usually beautiful and enviable face now shows a sickly pure white, haggard as if a flower that has been ravaged and withered, which makes people feel distressed and at the same time has a kind of desolate beauty.

Even Mikoto, who is of the same sex, involuntarily lost her mind for a moment before realizing that this was unusual.

It was only then that she remembered what Dome had said before, "try" and "do your best".

For those who are capable, these are actually two words that are difficult to put together. Because "trying" represents exploring the unknown, in the field of capability development, the unknown can only be explored cautiously, not by doing its best. It can even be said that the act of trying to explore the unknown is extremely dangerous.

The Tokiwadai Gymnasium accident just two months ago made this very clear. It's just that it was an accident at the time, and this time it was completely the choice of the parties.

If you think about it, School City never seems to have ever tried to stop time.

(Damn it...... ）

Of course she knew what Dome was thinking. In fact, she even felt that she should have thought of it a long time ago.

How can there be a miracle that can be risk-free?

A miracle without any sacrifice is always an impossible ideal. So in order for the miracle called salvation to appear, Dome chose to take all the dangers herself.

In terms of her personality, even if she would make this choice, Mikoto Misaka felt that she should be able to think of it. It's quite incomprehensible, but I didn't expect it.

Why is this happening? The reason is actually quite simple.

Because I've been in contact with Dome for a long time, it's always easy to unconsciously think that she can do things that others can't. In fact, most of the time it is. But things can't always be so ideal.

At least not this time.

Mikoto didn't know what kind of impact this would have, but judging from the situation at this time, it was obviously quite bad.

Come to think of it. Changing time is certainly not something that can be done at will. Such a simple conclusion, I didn't realize it from the beginning.

"Misaka-san......"

It wasn't until Dome repeated the call again that Mikoto came back to her senses.

Obviously, because of her personality, she is not too rational. Otherwise, she should have realized immediately that thinking about such a question at this time would only cause a greater burden on Dome Nai. After all, it can be seen from the demeanor of the dome at this time that it is impossible for her to maintain such a miracle for a long time.

If a miracle can be maintained at will, then it cannot be called a miracle.

Fortunately, the other side of her personality played a role.

"Leave it to me."

She's not too sane, which means she doesn't think too carefully. So when she came to her senses, her actions were very direct.

Although she boasts of a variety of applications, she herself is most accustomed to using her abilities in this way. As it happens, all that is needed now is pure destructive power.

The dome has done enough, and the rest is up to you.

The corners of her mouth even curved dangerously because of this.

"Everyone, all close your eyes!"

In the blue-white light,NO.3 of the school city announced so loudly。

Coincidentally, if the dome is the master's time and space, then what she has mastered is precisely the only ruler in time and space-

Thunder and light.

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Author's note: In this chapter, I took a moment to organize my words a little, hoping to express the meaning of pesticides clearly.